Okay so I had just finished reading the Sailor Stars Manga and I have a question about what happened to Luna, Artemis, and Diana. Were they reborn? I thought that it was mentioned that they had Crystals like Sailor Cyrstals, which meant that they could be reborn. I know they weren't shown at the wedding, but I thought this was due to the fact that there really was no place for them there? Also, at the end, isn't the Cyrstal Tokyo future confirmed, which includes the cats? I'm confused. :S
As long as their star seeds weren't destroyed, they lived... and from what I gathered from Stars, Sailor Moon threw herself into the cauldron to save everyone... All the people who's Sailor Crystals that Galaxia had taken. From what I understand, all the star seeds were in the cauldron and Chaos tried to merge with the cauldron.
Then a bunch of shooting stars come out of the cauldron, and Ceres asks what they are. Cosmos says they are reborn Star Seeds that will return to their original form once they find their way back to their planets. Cosmos assures the Quartette that everyone will arrive in the 30th century safely, so yes, from this information, it's safe to say that the cats live too.